Tie-plate.



L. DILWORTH. TIE PLATE. APPLICATION FILED OCT. 12, 1910.

1,093,256. Patented Apr. 14, 1914.

LAWRENCE DIIJWORITH, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TIJILWORTI'I, PORTER & COMPANY, LIMITED, 0F PITTSBURGH, PENNSYLVANIA, ALIMITED PARTNERSHIP.

TIE-PLATE.

1,093,256. specification of Letters Patent! Patented Apr. ia, rare.

Serial No. 586,655.

Application filed October 12, 1910.

To all whom it may concern Be it known that I, LAWRENCE DILWORTH, ofPittsburgh, Allegheny county, Pennsylvania, have invented a new anduseful Improvement in Tie-Plates, of which the following is a full,clear, and eXact description, reference being had to the accompanyingdrawings, forming part of this specification, in which Figure l is anend elevation of my improved tie plate showing the rail in dotted lines.Fig. 2 is a bottom perspective view.

My invention relates to the claw type of tie plate, such for example, asshown in the Goldie Patents 540,306, dated June 4th, 1895; 607 ,847dated June 26th, 1898, and

655,400, dated August 7th, 1900.

The object of the invention is to improve the structure of the plate, aswell as cheapen and lighten it without impairing its value or functions.

The advantages of providing such tie plates with recesses extendinglongitudinally of the rail in the body portion of the the rib; and iftwo top ribs are used, the claws are inside both ribs. After the plateis thus rolled, the base flanges are slotted to form the claws 5, andthe claws are then pointed and given a knife edge on their outer facesby cutters or dies, which act diagonally so that the edges 6 of theclaws slope inwardly toward the longitudinal centr al aXis of the plate.The plate is also pro vided with spike holes shown at 7, and these holesmay be located in any desirable manner, one of them preferably extendingthrough the rib, if one rib 'is used, or through both ribs, if two ribsare used on the top.

During the rolling of the plate it is formed with longitudinal groovesor recesses 8 in its central portion, these preferably being formed inthe top surface of the plate, though they may be formed in the bottom orpartially in both faces. The number and dimensions of these grooves maybe varied without departing from my invention. They may be continuous,or inplate are now well recognized in this termittent, but arepreferably continuous so art. In the Goldie form of tie plate, howandextendlng longitudinally of the plate ever, this recessing has not beenpracticable, and the rail. The plate is also preferably owing to thelocating of the claws near the side edges of the plate. On account ofthis positioning of the claws outside the rail base in prior tie plates,the central portion of the plate must be stiff and relatively heavy, sothat in driving the plate by the traffic on the rails it would not beliable to buckle or bow downwardly in its central portion.

I have found that by locating the claws under the rail base, andarranging them so that they are all directly underneath some portion ofthe base flanges of the rail, I can provide the plate with longitudinalgrooves, thus obtaining their advantages while retaining the advantagesof the claws.

In the drawings, I show a plate 2 having side edges 3, 3. This plate isrolled with a plurality of longitudinal flanges on its bottom, theseflanges being spaced inwardly to a sufficient distance to the side edgesso that they will come beneath the rail base. I also preferably roll theplate with an upper longitudinal rib 4:, which engages the edge of oneof the base flanges of the rail, though I may omit this rib or may rolltwo ribs on the top, one to engage each edge of the rail base. If onetop rib is used, the

.55 claws on that side of the plate are inside chamfered or beveled atits side portions, as shown at 9 to make the edge portion thinner thanthe intermediate portions between the grooves.

The advantages of my invention will be obvious to those skilled in theart, since owing to the locating of the claws underneath the rail base,I am enabled to provide the plate with the longitudinal grooves orrecesses, thus lightening it and giving the usual advantages of theserecessed portions. In driving this plate by the traffic there is notendency to buckle or bend, since the pressure comes direct on the clawswhich are underneath the plane of application of pressure.

It will be noted that I employ claws which are relatively short as towidth but which are of considerable depth, the depth in all cases beingconsiderably greater than the thickness of the ungrooved portion of thebody of the tie plate. By using claws of this form, which will readilyembed themselves to a very considerable depth in the ties, I obtain thenecessary lateral resistance for holding the rails to the seat and thusmaintaining the rails to a true gage. By locating these claws entirelyunderneath the base of the rail and relatively close to the center lineof the plate, they not only prevent buckling or bending of the plate,but are also forced to their seats by the direct pressure of the rails.

Variations may be made in the form and dimensions of the plate, and theclaws, without departing from my invention.

claim 1. A tie plate having projecting from its bottom face a pluralityof relatively narrow, deep, rolled and sharpened claws, locatedunderneath the rail base portion of the plate, substantially asdescribed.

2. A tie plate having a recess or depression beneath the rail base, saidplate having a plurality of relatively narrow, deep, rolled andsharpened claws projecting from M Copies of this patent may be obtainedfor five cents each, by addressing the rolled and sharpened claws sionbeneath the railbase, said plate hav ing a plurality of relativelynarrow, deep, projecting from its bottom face underneath the rail base,said plate having an upper longitudinal rib arranged to engage thesideedge of the railedge of the plate substantially as base and locatednearer the than the sharpened claws, described. r

In testimony whereof, I have hereunto set my hand.

' LAWRENCE DILWORTH. Witnesses: j

GEO. H. PARMELEE,

H. M. CORWIN.

Washington, D. G.

Commissioner of Patents, 7

